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    Method names should start from a capital letter in C#.

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    divideFractions("1/0","1/2") => returns null

    but

    • The fractions will never be improper.

    So this case is invalid.

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    Random tests appear to be broken.
    inputs: "62694/-18591" "1089/52122"
    expected: "1027230628/20245599"

    The expected is not even the correct sign. Are the random tests doing something like overflowing the int datatype?